// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart=2.9

/*@testedFeatures=inference*/
library test;

class A {}

class B extends A {
  A operator +(C v) => null;
  B operator -(int i) => null;
  B operator *(B v) => null;
  C operator &(A v) => null;
}

class C extends B {}

T f<T>() => null;

void test() {
  B local;
  local = /*@typeArgs=B**/ f();

  local  ??= /*@typeArgs=B**/ f();

  local /*@target=B.+*/ += /*@typeArgs=C**/ f();

  local /*@target=B.**/ *= /*@typeArgs=B**/ f();

  local /*@target=B.&*/ &= /*@typeArgs=A**/ f();

  /*@target=B.-*/ --local;

  local /*@target=B.-*/ --;

  var /*@type=B**/ v1 = local = /*@typeArgs=B**/ f();

  var /*@type=B**/ v2 =
      local  ??= /*@typeArgs=B**/ f();

  var /*@type=A**/ v3 = local
      /*@target=B.+*/ += /*@typeArgs=C**/ f();

  var /*@type=B**/ v4 = local
      /*@target=B.**/ *= /*@typeArgs=B**/ f();

  var /*@type=C**/ v5 = local
      /*@target=B.&*/ &= /*@typeArgs=A**/ f();

  var /*@type=B**/ v6 = /*@target=B.-*/ --local;

  var /*@type=B**/ v7 = /*@type=B**/ local
      /*@type=B**/ /*@target=B.-*/ --;
}

main() {}
